前端AES加密，后端解密，有效防止数据外泄

在工作中经常遇到密码明文传输这个问题，为了让密码安全些会让加密，现在有个比较方便的AES加密（前端密钥可能存在泄露风险，应该放到配置项中）：

一、前端加密

1、首先引入前端需要用到的js：crypto-js，下载地址：

CryptoJS-v4.1.1
https://www.aliyundrive.com/s/bXP6M8ZxVAD
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2、将 crypto-js 文件放到要引用的路径

3、以下是要引用到的js

<script src="../static/ajax/libs/captcha/crypto-js.min.js" th:src="@{/ajax/libs/captcha/crypto-js.min.js}"></script><script src="../static/ajax/libs/captcha/ase.min.js" th:src="@{/ajax/libs/captcha/ase.min.js}"></script>

4、在注册按钮的点击事件中，设置 key 值和 iv 值，这是加密的设置字段，定义要进行加密的密码 encryptedPwd

function register() {var password = $.common.trim($("input[name='password']").val());//AES加密var key = "ABCDEFGHIJKL_key";var iv = "ABCDEFGHIJKLM_iv";var encryptedPwd = aesMinEncrypt(key,iv,password); $.ajax({type: "post",url: ctx + "register",data: {"password": encryptedPwd,......}success: function (res) {} });}function aesMinEncrypt(key, iv, word){var _word = CryptoJS.enc.Utf8.parse(word),_key = CryptoJS.enc.Utf8.parse(key),_iv = CryptoJS.enc.Utf8.parse(iv);var encrypted = CryptoJS.AES.encrypt(_word, _key, {iv: _iv,mode: CryptoJS.mode.CBC,padding: CryptoJS.pad.Pkcs7});return encrypted.toString();}

二、后端解密

后端解密需要用到一个工具类：AESUtils，里面是解密方法代码如下：

1、添加AESUtils工具类

package com.wuye.common.utils; import cn.jpush.api.utils.StringUtils;import sun.misc.BASE64Decoder; import javax.crypto.Cipher;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec; /** * TODO * * @author CSD * @date 2022-07-28 14:16 */public class AESUtils { //密钥 (需要前端和后端保持一致)十六位作为密钥private static final String KEY = "ABCDEFGHIJKL_key"; //密钥偏移量 (需要前端和后端保持一致)十六位作为密钥偏移量private static final String IV = "ABCDEFGHIJKLM_iv"; //算法private static final String ALGORITHMSTR = "AES/CBC/PKCS5Padding"; /** * base 64 decode * @param base64Code 待解码的base 64 code * @return 解码后的byte[] * @throws Exception */public static byte[] base64Decode(String base64Code) throws Exception{return StringUtils.isEmpty(base64Code) " />null : new BASE64Decoder().decodeBuffer(base64Code);} /** * AES解密 * @param encryptBytes 待解密的byte[] * @return 解密后的String * @throws Exception */public static String aesDecryptByBytes(byte[] encryptBytes) throws Exception { Cipher cipher = Cipher.getInstance(ALGORITHMSTR); byte[] temp = IV.getBytes("UTF-8");IvParameterSpec iv = new IvParameterSpec(temp); cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(KEY.getBytes(), "AES"), iv);byte[] decryptBytes = cipher.doFinal(encryptBytes); System.out.print(new String(decryptBytes));return new String(decryptBytes);} /** * 将base 64 code AES解密 * @param encryptStr 待解密的base 64 code * @return 解密后的string * @throws Exception */public static String aesDecrypt(String encryptStr) throws Exception {return StringUtils.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr));} //测试一下public static void main(String[] args) throws Exception {String str = "Q uus tQvLdwtGSldhrtKQ==";str = str.replace(" ", "+");System.out.println(str);aesDecrypt(str);}}

2、在注册方法对 password 进行解密完成加解密操作

String decrypassword = AESUtils.aesDecrypt(password);